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30. EMPLOYEE BENEFITS (Details 8)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Plan covering 35% Of The Average Salary [member] | Male [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18.38 18.38
Average life expectancy in years of employees who are 40 (in years) 40.15 40.15
Plan covering 35% Of The Average Salary [member] | Female [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18.38 18.38
Average life expectancy in years of employees who are 40 (in years) 40.15 40.15
Average Salary Supplementation Plan [member] | Male [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 18.75 18.75
Average life expectancy in years of employees who are 40 (in years) 40.60 40.60
Average Salary Supplementation Plan [member] | Female [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 21.41 21.41
Average life expectancy in years of employees who are 40 (in years) 44.41 44.41
Mixed Supplementary Benefit Plan [member] | Male [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 21.47 20.45
Average life expectancy in years of employees who are 40 (in years) 44.07 42.70
Mixed Supplementary Benefit Plan [member] | Female [member]    
Disclosure of defined benefit plans [line items]    
Average life expectancy of employees (in years) 23.34 23.02
Average life expectancy in years of employees who are 40 (in years) 46.68 46.28